With an average altitude of 3,500 meters, Ruoergai is surrounded by towering mountains with vast wetlands. /VCG Photo

Its well-preserved environment makes it home to various wild animals and plants, including the precious black-necked crane. /VCG Photo

The land of Ruoergai is an important witness to history. In 1935, China's Red Army passed through Ruoergai during the epic Long March, a military maneuver that covered over 12,500 kilometers from October 1934 to October 1936. /VCG Photo